﻿using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            Label3.Text = "atencion: este es su 1ª ingreso!!!";
        }
        else
        {
            Label3.Text = "atencion: Esta página ya ha sido visitada";
        }


    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text!=string.Empty)
        {
            if (TextBox2.Text!=string.Empty)
            {
                TextBox3.Text = TextBox1.Text + ", " + TextBox2.Text;

            }
            else
            {
                TextBox2.Text = "ingrese apellido";
            }
            
        }
        else
        {
            TextBox1.Text = "ingrese apellido";
        }
    }
}
